xfs: pass the actual offset and len to allocate to xfs_bmapi_allocate

Source kernel commit: 2a9b99d45be0981536f6d3faf40ae3f58febdd49

xfs_bmapi_allocate currently overwrites offset and len when converting
delayed allocations, and duplicates the length cap done for non-delalloc
allocations.  Move all that logic into the callers to avoid duplication
and to make the calling conventions more obvious.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c
index 87f0a28534b4ff6ecb53da81d8c5f8606aa47c58..a498894fc3607d38201893bfc4bcea25571ac5b3 100644 (file)
--- a/libxfs/xfs_bmap.c
+++ b/libxfs/xfs_bmap.c
@@ -4179,21 +4179,11 @@ xfs_bmapi_allocate(
        int                     error;
 
        ASSERT(bma->length > 0);
+       ASSERT(bma->length <= XFS_MAX_BMBT_EXTLEN);
 
-       /*
-        * For the wasdelay case, we could also just allocate the stuff asked
-        * for in this bmap call but that wouldn't be as good.
-        */
        if (bma->wasdel) {
-               bma->length = (xfs_extlen_t)bma->got.br_blockcount;
-               bma->offset = bma->got.br_startoff;
                if (!xfs_iext_peek_prev_extent(ifp, &bma->icur, &bma->prev))
                        bma->prev.br_startoff = NULLFILEOFF;
-       } else {
-               bma->length = XFS_FILBLKS_MIN(bma->length, XFS_MAX_BMBT_EXTLEN);
-               if (!bma->eof)
-                       bma->length = XFS_FILBLKS_MIN(bma->length,
-                                       bma->got.br_startoff - bma->offset);
        }
 
        if (bma->flags & XFS_BMAPI_CONTIG)
@@ -4527,6 +4517,15 @@ xfs_bmapi_write(
                         */
                        bma.length = XFS_FILBLKS_MIN(len, XFS_MAX_BMBT_EXTLEN);
 
+                       if (wasdelay) {
+                               bma.offset = bma.got.br_startoff;
+                               bma.length = bma.got.br_blockcount;
+                       } else {
+                               if (!eof)
+                                       bma.length = XFS_FILBLKS_MIN(bma.length,
+                                               bma.got.br_startoff - bno);
+                       }
+
                        ASSERT(bma.length > 0);
                        error = xfs_bmapi_allocate(&bma);
                        if (error) {
@@ -4680,11 +4679,16 @@ xfs_bmapi_convert_one_delalloc(
        bma.tp = tp;
        bma.ip = ip;
        bma.wasdel = true;
-       bma.offset = bma.got.br_startoff;
-       bma.length = max_t(xfs_filblks_t, bma.got.br_blockcount,
-                       XFS_MAX_BMBT_EXTLEN);
        bma.minleft = xfs_bmapi_minleft(tp, ip, whichfork);
 
+       /*
+        * Always allocate convert from the start of the delalloc extent even if
+        * that is outside the passed in range to create large contiguous
+        * extents on disk.
+        */
+       bma.offset = bma.got.br_startoff;
+       bma.length = bma.got.br_blockcount;
+
        /*
         * When we're converting the delalloc reservations backing dirty pages
         * in the page cache, we must be careful about how we create the new